To prevent an unwanted incident after evacuating the log tunnel, you should always make sure to do one final wipe of your entire anal crevice and surrounding area to ensure that there is no more shit on your ass.

"I've been feeling really dodgy mate, so I did a couple extra insurance wipes just to be sure.."

The action of wiping after a clean poop thus insuring yourself of a clean balloon knot.

Sam: "Man i just wasted four squares of toilet paper!"
Devin: "What do you mean?"
Sam: "There was no poop on the toilet paper after I wiped."
Devin: "Well, then consider it an insurance wipe, you can never be too safe!"